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Search for the double-beta decay of 82Se to the excited states of 82Kr with NEMO-3

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arxiv 2001.06388 v1 pith:IMW6AMJO submitted 2020-01-17 physics.ins-det hep-ex

Search for the double-beta decay of 82Se to the excited states of 82Kr with NEMO-3

The NEMO-3 collaboration R. Arnold , C. Augier , A.S. Barabash , A. Basharina-Freshville , S. Blondel , S. Blot , M. Bongrand , D. Boursette
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R. Breier V. Brudanin J. Busto A.J. Caffrey S. Calvez M. Cascella C. Cerna J. P. Cesar A. Chapon E. Chauveau A. Chopra L. Dawson D. Duchesneau D. Durand V. Egorov G. Eurin J.J. Evans L. Fajt D. Filosofov R. Flack X. Garrido C. Girard-Carillo H. G\'omez B. Guillon P. Guzowski R. Hodak A. Huber P. Hubert C. Hugon S. Jullian A. Klimenko O. Kochetov S.I. Konovalov V. Kovalenko D. Lalanne K. Lang Y. Lemi\`ere T. Le Noblet Z. Liptak X. R. Liu P. Loaiza G. Lutter M. Macko C. Macolino F. Mamedov C. Marquet F. Mauger A. Minotti B. Morgan J. Mott I. Nemchenok M. Nomachi F. Nova F. Nowacki H. Ohsumi G. Olivi\'ero R.B. Pahlka V. Palusova C. Patrick F. Perrot A. Pin F. Piquemal P. Povinec P. P\v{r}idal Y.A. Ramachers A. Remoto J.L. Reyss B. Richards C.L. Riddle E. Rukhadze R. Saakyan R. Salazar X. Sarazin J. Sedgbeer Yu. Shitov L. Simard F. Simkovic A. Smetana K. Smolek A. Smolnikov S. S\"oldner-Rembold B. Soul\'e I. \v{S}tekl J. Suhonen C.S. Sutton G. Szklarz H. Tedjditi J. Thomas V. Timkin S. Torre Vl.I. Tretyak V.I. Tretyak V.I. Umatov I. Vanushin C. Vilela V. Vorobela D. Waters F. Xie A. \v{Z}ukauskas
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classification physics.ins-det hep-ex
keywords decaybeenstatedetectordouble-betaexcitedlimitnemo-3
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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The double-beta decay of 82Se to the 0+1 excited state of 82Kr has been studied with the NEMO-3 detector using 0.93 kg of enriched 82Se measured for 4.75 y, corresponding to an exposure of 4.42 kg y. A dedicated analysis to reconstruct the gamma-rays has been performed to search for events in the 2e2g channel. No evidence of a 2nbb decay to the 0+1 state has been observed and a limit of T2n 1/2(82Se; 0+gs -> 0+1) > 1.3 1021 y at 90% CL has been set. Concerning the 0nbb decay to the 0+1 state, a limit for this decay has been obtained with T0n 1/2(82Se; 0+g s -> 0+1) > 2.3 1022 y at 90% CL, independently from the 2nbb decay process. These results are obtained for the first time with a tracko-calo detector, reconstructing every particle in the final state.

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